Optical Properties of Ni/NiOx as Infiltration Agent in Cermet Solar Ir Absorber

The Ni/NiOx films were deposited onto micro-glass substrates by spray pyrolysis (SPD). As precursors, aqua nickel acetate solutions were used. Deposition parameters such as temperature substrate and spraying solution concentration were varied for optimizing the Ni/NiOx cermet properties. The optical properties of the films (a, e) were correlated with their chemical composition, crystalline structure and morphology. At the deposition condition, the major phase is cubic NiO. The annealing increases the crystallinity degree offering good values of solar absorbance (a=0.91) and emittance (e=0.07).

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Optical Properties of Thin Films of Haycockite

MRS Advances ◽

10.1557/adv.2019.273 ◽

2019 ◽

Vol 4 (37) ◽

pp. 2023-2033

Author(s):

Barys Korzun ◽

Marin Rusu ◽

Thomas Dittrich ◽

Anatoly Galyas ◽

Andrey Gavrilenko

Keyword(s):

Thin Films ◽

Optical Properties ◽

Chemical Composition ◽

Energy Band ◽

Surface Photovoltage ◽

Second Phase ◽

Energy Band Gap ◽

Flash Evaporation ◽

Glass Substrates ◽

Evaporation Technique

ABSTRACTThin films of haycockite Cu4Fe5S8 on glass substrates were deposited by flash evaporation technique from powders of this compound. The composition of thin films correspond to the atomic content of Cu, Fe, and S of 24.13, 27.90, and 47.97 at.% with the Cu/ Fe and S/ (Cu + Fe) atomic ratios of 0.87 and 0.92 respectively, whereas the corresponding theoretical values for this material amount to 0.80 and 0.89. The as-prepared thin films of haycockite consist of a set of separate fractions of approximately identical areas of about 400 - 600 μm2. It can be assumed that this structure evolved during cooling down of thin films since it completely covers the surface of thin films. A small inclusion of a second phase with the chemical composition close to talnakhite Cu9Fe8S16 is also observed. Haycockite Cu4Fe5S8 is found to be a direct gap semiconductor with the energy band gap Eg equal to 1.26 eV as determined using both transmission and surface photovoltage methods.

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EFFECTS OF SPRAY PYROLYSIS DEPOSITION PARAMETERS ON MORPHOLOGICAL, OPTICAL AND STRUCTURAL PROPERTIES OF WO3 NANOSTRUCTURED THIN FILMS

Surface Review and Letters ◽

10.1142/s0218625x19502032 ◽

2020 ◽

Vol 27 (09) ◽

pp. 1950203

Author(s):

ALI AKHAVAN MAVARDIANI ◽

MOHAMMAD BAGHER RAHMANI

Keyword(s):

Thin Films ◽

Surface Morphology ◽

Spray Pyrolysis ◽

Precursor Solution ◽

Cost Effective ◽

Solution Concentration ◽

Visible Range ◽

Glass Substrates ◽

Deposition Parameters ◽

Vis Spectroscopy

In this experimental research, tungsten trioxide (WO3) thin films were deposited using ammonium tungstate ((NH4)2WO4) by a simple and cost-effective technique of spray pyrolysis on top of glass substrates. The surface morphology, structural and optical properties of prepared samples were studied using field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) pattern analysis and UV–Vis spectroscopy techniques, respectively. Studied deposition parameters were: substrate temperature (300, 350, 400, 450 and 500∘C), concentration of the precursor solution (0.01, 0.02, 0.04, 0.08, 0.1 and 0.2[Formula: see text]M), volume of the precursor solution (50, 100, 150 and 200[Formula: see text]mL) and the effect of pulsed spraying at different concentrations (0.01, 0.1 and 0.2[Formula: see text]M). FESEM images showed that the surface morphology has formed like nested micro-fibrous rings with a uniform distribution all over the surface. The XRD patterns revealed that increasing the solution concentration to 0.2[Formula: see text]M shows some peaks which can be attributed to WO3 with the hexagonal crystal structure. Transmission spectra of the samples indicate that all of the prepared samples are transparent in the visible range, with the calculated direct bandgap ranging from about 2.93[Formula: see text]eV to 3.96[Formula: see text]eV, depending on the deposition conditions.

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Structural and Texture Studies of PbS Thin Film

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.442.123 ◽

2010 ◽

Vol 442 ◽

pp. 123-129 ◽

Cited By ~ 2

Author(s):

S.K. Mehmood ◽

S. Zaman ◽

K. Ahmed ◽

M.M. Asim

Keyword(s):

Thin Film ◽

Thin Films ◽

Optical Properties ◽

Thermal Treatment ◽

Hydrazine Hydrate ◽

Structural Parameters ◽

Glass Substrates ◽

Deposition Parameters ◽

Cubic Structure ◽

Post Deposition

In this study, we report on the structural parameters and texture development which occurred during deposition and annealing of PbS films and their effect on optical properties. The films under study were deposited on glass substrates through chemical bath method. The reactive substances used to obtain the PbS layers were lead accetae trihydrated, thiourea and hydrazine hydrate. The films were prepared with one molar bath concentration and for various deposition times. The data showed that as-prepared and annealed thin films are polycrystalline with cubic structure and predominantly textured along 100. Results showed that thinner films are more prone to post deposition heat treatments as compared to thicker ones. Deposition parameters and thermal treatment strongly influence the optical properties of PbS films.

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Synthesis and Characterization of SnS Nanoparticles through a Non-Aqueous Chemical Route for Depositing Photovoltaic Absorber Layers

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.28.91 ◽

2014 ◽

Vol 28 ◽

pp. 91-99 ◽

Cited By ~ 2

Author(s):

Mou Pal ◽

A. Martinez Ayala ◽

N.R. Mathews ◽

X. Mathew

Keyword(s):

Optical Properties ◽

Chemical Composition ◽

Near Infrared ◽

Blue Shift ◽

Xrd Analysis ◽

Optical Absorption Spectroscopy ◽

Complexing Agent ◽

Chemical Route ◽

X Ray ◽

Glass Substrates

SnS nanocrystals of sub-10 nm in size were synthesized by a room temperature, non-aqueous chemical route in the presence of different amounts of triethanolamine (TEA) used as a complexing agent. The crystallinity, size, morphology, chemical composition and optical properties of the as-prepared SnS nanoparticles were investigated by powder X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), Energy-dispersive X-ray spectroscopy (EDS), micro Raman and optical absorption spectroscopy. The XRD analysis and HRTEM investigation of SnS nanoparticles confirmed the presence of crystalline orthorhombic SnS phase. Upon increasing the amount of TEA, the crystallite size of the samples decreased gradually showing evidence of quantum confinement. EDS analysis showed that SnS nanoparticles (NPs) grown in absence of TEA were highly stoichiometric whereas in TEA capped samples, the atomic concentration of S is slightly higher than that of Sn. As-synthesized SnS nanocrystals displayed strong absorption in the visible and near-infrared spectral regions followed by a blue shift of their absorption edge on increasing the TEA concentration. These nanoparticles were used to prepare SnS paste which was deposited on conducting glass substrates to obtain thin films for photovoltaic applications. The crystallinity, morphology, chemical composition and optical properties of annealed SnS films were investigated.

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Structural/Property Relationships for Optical Materials

MRS Proceedings ◽

10.1557/proc-329-215 ◽

1993 ◽

Vol 329 ◽

Author(s):

Vivien D.

Keyword(s):

Crystal Structure ◽

Optical Properties ◽

Electronic Structure ◽

Chemical Composition ◽

Field Strength ◽

Optical Materials ◽

Site Occupancy ◽

Laser Materials ◽

Crystal Field Strength ◽

The Matrix

AbstractIn this paper the relationships between the crystal structure, chemical composition and electronic structure of laser materials, and their optical properties are discussed. A brief description is given of the different laser activators and of the influence of the matrix on laser characteristics in terms of crystal field strength, symmetry, covalency and phonon frequencies. The last part of the paper lays emphasis on the means to optimize the matrix-activator properties such as control of the oxidation state and site occupancy of the activator and influence of its concentration.

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Sol-gel growth of Ni doped CdS on glass substrates: effect of spin coating speed and dopant concentration

Nanoscience &Nanotechnology-Asia ◽

10.2174/2210681210999200423120817 ◽

2020 ◽

Vol 10 ◽

Author(s):

Atefeh Nazari Setayesh ◽

Hassan Sedghi

Keyword(s):

Thin Films ◽

Optical Properties ◽

Spin Coating ◽

Optical Band Gap ◽

Dopant Concentration ◽

Rotation Speed ◽

Sol Gel ◽

Band Gap Energy ◽

Gap Energy ◽

Glass Substrates

Background: In this work, CdS thin films were synthesized by sol-gel method (spin coating technique) on glass substrates to investigate the optical behavior of the film. Methods: Different substrate spin coating speeds of 2400, 3000, 3600 rpm and different Ni dopant concentrations of 0 wt.%, 2.5 wt.%, 5 wt.%) were investigated. The optical properties of thin films such as refraction index, extinction coefficient, dielectric constant and optical band gap energy of the layers were discussed using spectroscopic ellipsometry method in the wavelength range of 300 to 900 nm. Results: It can be deduced that substrate rotation speed and dopant concentration has influenced the optical properties of thin films. By decreasing rotation speed of the substrate which results in films with more thicknesses, more optical interferences were appeared in the results. Conclusion: The samples doped with Ni comparing to pure ones have had more optical band gap energy.

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Deposition time dependent study of structural and optical properties of PbS thin films grown by CBD method

Recent Innovations in Chemical Engineering (Formerly Recent Patents on Chemical Engineering) ◽

10.2174/2405520413999200517123919 ◽

2020 ◽

Vol 13 ◽

Author(s):

Minakshi Chaudhary ◽

Yogesh Hase ◽

Ashwini Punde ◽

Pratibha Shinde ◽

Ashish Waghmare ◽

...

Keyword(s):

Thin Films ◽

Optical Properties ◽

Band Gap ◽

Deposition Time ◽

Secondary Growth ◽

Cost Effective ◽

Xrd Analysis ◽

Structural Morphology ◽

Glass Substrates ◽

Cbd Method

: Thin films of PbS were prepared onto glass substrates by using a simple and cost effective CBD method. Influence of deposition time on structural, morphology and optical properties have been investigated systematically. The XRD analysis revealed that PbS films are polycrystalline with preferred orientation in (200) direction. Enhancement in crystallinity and PbS crystallite size has been observed with increase in deposition time. Formation of single phase PbS thin films has been further confirmed by Raman spectroscopy. The surface morphology analysis revealed the formation of prismatic and pebble-like PbS particles and with increase in deposition time these PbS particles are separated from each other without secondary growth. The data obtained from the EDX spectra shows the formation of high-quality but slightly sulfur rich PbS thin films over the entire range of deposition time studied. All films show increase in absorption with increase in deposition time and a strong absorption in the visible and sub-band gap regime of NIR range of the spectrum with red shift in band edge. The optical band gap shows decreasing trend, as deposition time increases but it is higher than the band gap of bulk PbS.

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Seed Layer-Assisted Chemical Bath Deposition of Cu2O Nanoparticles on ITO-Coated Glass Substrates with Tunable Morphology, Crystallinity, and Optical Properties

Journal of Inorganic and Organometallic Polymers and Materials ◽

10.1007/s10904-021-02016-y ◽

2021 ◽

Author(s):

Forat H. Alsultany ◽

Sarmad Fawzi Hamza Alhasan ◽

Evan T. Salim

Keyword(s):

Optical Properties ◽

Chemical Bath Deposition ◽

Seed Layer ◽

Coated Glass ◽

Glass Substrates ◽

Cu2o Nanoparticles ◽

Tunable Morphology

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Improving Performance of CIGS Solar Cells by Annealing ITO Thin Films Electrodes

International Journal of Photoenergy ◽

10.1155/2015/483147 ◽

2015 ◽

Vol 2015 ◽

pp. 1-8 ◽

Cited By ~ 4

Author(s):

Chuan Lung Chuang ◽

Ming Wei Chang ◽

Nien Po Chen ◽

Chung Chiang Pan ◽

Chung Ping Liu

Keyword(s):

Thin Films ◽

Optical Properties ◽

Solar Cells ◽

Indium Tin Oxide ◽

Copper Indium Gallium Diselenide ◽

Glass Substrates ◽

Ito Film ◽

Ito Thin Films ◽

Cigs Solar Cells ◽

Ito Films

Indium tin oxide (ITO) thin films were grown on glass substrates by direct current (DC) reactive magnetron sputtering at room temperature. Annealing at the optimal temperature can considerably improve the composition, structure, optical properties, and electrical properties of the ITO film. An ITO sample with a favorable crystalline structure was obtained by annealing in fixed oxygen/argon ratio of 0.03 at 400°C for 30 min. The carrier concentration, mobility, resistivity, band gap, transmission in the visible-light region, and transmission in the near-IR regions of the ITO sample were-1.6E+20 cm−3,2.7E+01 cm2/Vs,1.4E-03 Ohm-cm, 3.2 eV, 89.1%, and 94.7%, respectively. Thus, annealing improved the average transmissions (400–1200 nm) of the ITO film by 16.36%. Moreover, annealing a copper-indium-gallium-diselenide (CIGS) solar cell at 400°C for 30 min in air improved its efficiency by 18.75%. The characteristics of annealing ITO films importantly affect the structural, morphological, electrical, and optical properties of ITO films that are used in solar cells.

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